A COMPARISON OF THE REPRODUCTION OF BREVICORYNE BRASSICAE AND MYZUS PERSICAE IN RELATION TO SOLUBLE NITROGEN CONCENTRATION AND LEAF AGE (LEAF POSITION) IN THE BRUSSELS SPROUT PLANT

Se han identificado las siguientes especies procedentes del valle de cañete : Aphis citicola, A.craccivora, A. fabae, A.gossypii, Brevicoryne,brassicae, Lypaphis erysimi Macrosiphum euphorbiae, M. rosae, Myzus persicae, Riopalosiphum maidis, R. padi, toxoptera aurantii, T. citricidus y tuberolachnus salignus Todos los áfidos identificados representan especies de importancia económica, excepto el último.

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Susceptibility of Myzus persicae, Brevicoryne brassicae and Nasonovia ribisnigri to Fungal Biopesticides in Laboratory and Field Experiments

Insects ◽

10.3390/insects11010055 ◽

2020 ◽

Vol 11 (1) ◽

pp. 55

Author(s):

Gill Prince ◽

Dave Chandler

Keyword(s):

Field Experiment ◽

Myzus Persicae ◽

Field Experiments ◽

Brevicoryne Brassicae ◽

Vegetable Crops ◽

Potato Aphid ◽

Cabbage Aphid ◽

Nasonovia Ribisnigri ◽

Fungal Biopesticides ◽

Peach Potato Aphid

The aim of this study was to evaluate the potential of entomopathogenic fungi (EPF) for the control of aphid pests of field vegetable crops. Four biopesticides based on the EPF Beauveria bassiana (Botanigard ES and Naturalis L), Cordyceps fumosorosea s.l. (Preferal WG), and Akanthomyces dipterigenus (Vertalec) were evaluated in a laboratory bioassay against peach-potato aphid Myzus persicae, cabbage aphid Brevicoryne brassicae, and currant-lettuce aphid Nasonovia ribisnigri. There was significant variation in the spore dose provided by the products, with Botanigard ES producing the highest dose (639 viable spores per mm2). Botanigard ES also caused more mortality than the other products. Combining Vertalec with the vegetable oil-based adjuvant Addit had an additive effect on the mortality of B. brassicae. All fungal products reduced the number of progeny produced by M. persicae but there was no effect with B. brassicae or N. ribisnigri. When aphid nymphs were treated with Botanigard ES and Preferal WG, both products reduced population development, with up to 86% reduction occurring for Botanigard ES against M. persicae. In a field experiment, Botanigard ES sprayed twice, at seven-day intervals, against B. brassicae on cabbage plants, reduced aphid numbers by 73%. In a second field experiment with B. brassicae, M. persicae, and N. ribisnigri, Botanigard ES reduced populations of B. brassicae and N. ribisnigri but there was no significant effect on M. persicae.

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The effect of Brevicoryne brassicae on leaf area, dry matter distribution and amino acids of the Brussels sprout plant

Annals of Applied Biology ◽

10.1111/j.1744-7348.1990.tb06599.x ◽

1990 ◽

Vol 116 (2) ◽

pp. 199-204

Author(s):

H. F. VAN EMDEN

Keyword(s):

Amino Acids ◽

Leaf Area ◽

Dry Matter ◽

Brevicoryne Brassicae ◽

Brussels Sprout ◽

Matter Distribution ◽

Dry Matter Distribution

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The effect of DDT on Myzus persicae (SULZ.) and Brevicoryne brassicae (L.) (Aphididae) in relation to the spread of cauliflower mosaic and cabbage black ring spot viruses

Bulletin of Entomological Research ◽

10.1017/s0007485300048501 ◽

1963 ◽

Vol 53 (4) ◽

pp. 779-784 ◽

Cited By ~ 2

Author(s):

G. D. Heathcote ◽

J. Ward

Keyword(s):

Myzus Persicae ◽

Brevicoryne Brassicae ◽

Black Ring ◽

Cauliflower Mosaic Virus ◽

Virus Diseases ◽

Spot Virus ◽

Treated Plant ◽

Previously Treated ◽

Ring Spot ◽

Do So

Previous work in Britain has shown that insecticides, even systemic ones, fail to protect brassica plants in the seed-bed from virus diseases transmitted by aphids, and an explanation was sought through experiments carried out at Rothamsted. Observations on the effect on apterae and alates of Myzus persicae (Sulz.) of contact with leaves detached from cauliflower plants previously treated with a 0·2 per cent. DDT emulsion spray showed that exposure for up to 30 min. was insufficient to kill the majority of those tested, although many were temporarily incapacitated; alatae of Brevicoryne brassicae (L.) were even less affected.In cage experiments using infected and healthy cauliflower seedlings, apterae of M. persicae were able to transmit cauliflower mosaic virus (ClMV) and cabbage black ring spot virus (CBRSV) from infected to healthy seedlings when no spray was used, but failed to do so when the infected plants were sprayed with DDT; when alates were used in similar tests using only CBRSV, only low rates of transmission were obtained. In similar experiments using turnip seedlings and ClMV, transmission by apterae of M. persicae was high on untreated plants when the infector plant was itself untreated, but distinctly lower when it was sprayed with DDT; alates of M. persicae were found to transmit ClMV from a DDT-treated infector to untreated plants but not to a treated plant. Virus spread was thus reduced but not prevented by the use of DDT sprays. It is considered that these results lend support to the hypothesis that increase of virus within a seed-bed is preponderantly the result of the arrival, in succession, of many individual viruliferous alates from outside.

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Recovery From Water Stress in Five Sunflower (Helianthus annuus L.) Cultivars. II. The Development of Leaf Area

Functional Plant Biology ◽

10.1071/pp9820449 ◽

1982 ◽

Vol 9 (4) ◽

pp. 449 ◽

Cited By ~ 21

Author(s):

HM Rawson ◽

NC Turner

Keyword(s):

Soil Moisture ◽

Water Stress ◽

Leaf Area ◽

Old Age ◽

Leaf Age ◽

Leaf Position ◽

Water Application ◽

Leaf Emergence ◽

Young Leaves ◽

The Difference

Five cultivars of sunflower with different durations to anthesis were grown in the field either entirely on stored soil moisture (DRY), irrigated frequently throughout growth (WET), or transferred from the DRY to the WET regime at 44 days (REC 1) or at 54 days from sowing (REC 2). The expansion patterns of all leaves were followed with a view to determining which leaves responded when stress was relieved. Cultivars differed in their ability to recommence leaf expansion after water was applied to DRY crops, but any differences were related to the stage of plant development reached when water was applied. Thus in the REC 1 treatment, no leaves of early cultivars equalled the areas achieved in equivalent leaves in the WET regime, whereas the latest cultivar generated individual leaves which were 60% larger than equivalent leaves in the WET treatment. In the REC 2 treatment, few leaves of the early cultivars reached significantly larger areas than equivalent leaves in the DRY while all leaves above node 12 in the latest cultivar exceeded those in the DRY regime. Examining the data in terms of the age of leaves in the profile when the REC 1 and REC 2 treatments were applied showed that, regardless of cultivar, all leaves which were less than 15 days old (age 0 = leaf emergence) had some capacity for renewed expansion when water was applied. However, primordia which still had 15 days to go before they emerged as leaves had the greatest capacity for expansion to a potential size, and this capacity decreased progressively over their next 30 days of aging. Leaf age profiles did not explain all the difference in renewed expansion potential among cultivars: a leaf position factor at the time of water application was almost as important. Thus, the closer that leaves were to the head, the less was their capacity for renewed expansion regardless of their age. In order to achieve larger areas when water was applied, old leaves increased their duration of expansion while young leaves increased their rate of expansion. It is concluded that cultivars do not differ in their ability to 'recover' leaf area upon application of water except by virtue of their different durations to anthesis.

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